//引入使用
downloadFileRename(url,name.ext)

/**
 * 下载文件并重命名 *
 * @param {String} url 文件地址
 * @param {String} filename 文件名称
 */
export function downloadFileRename(url, filename) {
  function getBlob(url) {
    return new Promise((resolve) => {
      const xhr = new XMLHttpRequest()
      xhr.open('GET', url, true)
      xhr.responseType = 'blob'
      xhr.onload = () => {
        if (xhr.status === 200) {
          resolve(xhr.response)
        }
      }
      xhr.send()
    })
  }
  function saveAs(blob, filename) {
    if (window.navigator.msSaveOrOpenBlob) {
      navigator.msSaveBlob(blob, filename)
    } else {
      const link = document.createElement('a')
      const body  = document.querySelector('body')

      link.href = window.URL.createObjectURL(blob)
      link.download = filename

      // fix Firefox
      link.style.display = 'none'
      body.appendChild(link)

      link.click()
      body.removeChild(link)

      window.URL.revokeObjectURL(link.href)
      return
    }
  }
  getBlob(url).then((blob) => {
    saveAs(blob, filename)
  })
}